You can help her get a little more organized. Some people find it so very hard to throw things out, even when that's the best option. Those people find it much easier to give things instead of throwing them away.
Tell her that you may not be able to use everything personally, but you will find homes for that which you don't want. Point out that some things maybe should be thrown out, like the cracked container. Books can be donated to the local library. (Our library has periodic book sales.)
Throw the trash out, recycle, and take the rest to a charity, like Goodwill, Salvation Army, or whatever.
I'm one of "those people". I was brought up to waste not, want not.
Use it up
Wear it out
Make it do
Or do without